Mill-pinion.



AE. s. BLACK.

MILL PINION.

APPLICATION man ocT.16, 1915.

Patented Feb. A15, 1916.r

2 SHEETS-SHEET 2.

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E WITNES STATES PATENT oEEIoE.

EDWARD S. BLACK, E CHICAGO, ILLINOIS, ASSIGNOR T O EDGAR ALLEN AMERICAN MANGANESE STEEL COMPANY, 0F AUGUSTA, MAINE, A C013,1OlR..A'J.I01Tl 0F MAINE.

MrLLPINioN.

Specification of Letters Patent.

Patented Feb. 15, 1916.

Application led October 16, 1915. Serial No. 56,200.

' of Chicago, in the county of Cook and State Fig. 2 i Va sectional view thereof taken on.

of Illinois, have made and invented certain new and useful Improvements in Mill-Pinions, of which the following is aspecification.

This invention relates to mill pinions and mill rolls, and more particularly to that class or ltype thereof which are formed of two or more parts, the object being to so construct and arrange the parts that they maybe most securely held together, whereby the mill pinions or rolls will possess the rigidi-ty. and advantages of an integral pinion. In attaining the aforementioned object, due provision is made 'for the casting within the.

drag end of the mold, those parts of the pinion which will be subjected to excessive strains, this feature being of particular importance in the forming of pinions of manganese steel.

A further object is to provide the parts which go to make] up the completed pinion of such design and arrangement that they can be economically cast, and easily fitted together,- and when so secured, will eiiciently resist all 'vend thrusts which tend to change the overall length of the pinion, and other stresses to which the pinion will be neces.

. make up the complete'mlll vpinion are sesarilj,7 exposed during service.

.Other objects and advantages will appear as the description proceeds, wherein it isv to be understood that changes in the precise embodiment of the invention can be made within the scope of what is claimed, without departing from the spirit thereof'.v n

The preferred embodiment of my invention is disclosed in the accompanying drawings, wherein: l

Figure 1 is a View in longitudinal section ofv a mill pinion embodying my invention;

the line 2-2 of Fig. l; Fig. 3 'is a'view in longitudinal sectionl of a lslightly modified form of connection between the two parts of the pinion; Fig. 4c is a view in section taken on the line 4-4 of Fig. 3; Fig. 5 ,is a view in longitudinal section of a somewhat further lmodified form of mill pinion, the connection l or securement between the parts bemg esltablished by a third memberl or sleeve upon which the parts of the pinion are shrunk, and to which they .are keyed.; Fig. 6 `1s a View in section taken on the .line 6-6 of F 1g. 5; Flg. 7 1s a view in longitudinal section of a further modification of the mill pinion, and Fig. 48 is a View in section taken on the line 8--8` of Fig. 7.

Referring specically to Figsjl and 2, the mill pinion as therein disclosed, is formed with the ltoothed shells 10-11, from the remote extremities of which project the half-shafts 12-13. These half-shafts each include a bearing portion 14, and power transmitting end 15. The inner or meeting extremities of the toothed shells which con- ]o1ntly form the mill pinion, considered in connection with the projecting half-shafts,

are securely held together and Ain alinement Y by the provision of a sleeve 16 which is cast integral with the toothed shell 10 and pro? jects longitudinally therefrom. The sleeve 16 is ofsuch external diameter that it can be forced within the extremity of the toothed shell 11, or the latter may be shrunk thereon. The half-shafts are cored as at 17, as is customary, and in connection with the hollow toothed' shells A10-11 and hollow sleeve 16, providea comparatively light, but extremely rigid, construction.

The toothed shells are provided with the longitudinally extending alined openings 18,

through which suitable holding bolts 19 extend, whereby the ltwo portions which go to curely held together, there being suitable re cesses 20 formed within the toothed shells for the reception of the bolt heads and nuts. Should either of the half-shafts which are formed integral with the toothed shells become broken in service, the entirev pinion need not bev discarded, but a new half-shaft' and integral ,shell maybe substitutedfor that which failed.

A somewhat similar form of mill pinion the above-described form. The weight of this latter pinion is somewhat reduced, in-

asmuch as-th shell 11 is provided with a recess into which the 4sleeve 21 of the shell l0 extends.`

sitions. A key 2G is employed in .this connection, and further assists in holding the two portions of the pinion against displacement.

A further type of mill pinion which is formed in more than one part, is disclosed in Figs. 7 and 8, wherein a single toothed shell 27 is cast integral with the half-shaft Q8, the other half-shaft 29 being provided with a sleeve portion 30 which its within, andextends substantially the entire length of, the toothed shell 27. A key 3l engages the sleeve 30 and the toothed shell 27, and prevents the relative displacement of the parts. In addition to the holding action of the key 31, the toothed shell is preferably shrunk upon the sleeve 30 of the half-shaft 29, so that a most secure holding action and rigid securement between the two, will be effected. The free extremity of the shell 27 is provided with the annular recess 32, into which the shoulder or flange 33 of the halfshaft 29 extends, thus positively preventing the changing of the overall dimension of the pinion, due `to end thrusts.

From-the foregoing it will be apparent that I have provided for thek formation of mill pinions in two separate parts, the parts being'secured together by such means as will positively prevent the overall dimensions thereof from beingchanged by end thrusts, and furthermore, should any portion of Ithe pinion become broken, the broken part may be removed and a new one substituted therefor. Furthermore, the

j two portions which go to make up the completed pinion may be cast of manganese h steel and so arranged within the mold that i along the shaft, as has heretofore happened,

y thatportion of the pinion which is particularly susceptible to failure, may occupy the drag end of the mold, and thus possess the requisite strength. Furthermore, there will be no danger of the toothed shell moving the -shell in the present instance being formed as a part of, and integral with, the shaft itself. It isto be understood in connection with the foregoing that, although the invention has been particularly described as being a mill pinion, it .will be said shell and held in alinement with the irst-mentioned halfshaft thereby and provided with a power transmitting end.

2. An article of the class described comprising a shell, a half-shaft formed integral therewith, and a second half-shaft secured to said shell and held in alinement with the first-mentioned half-shaft thereby, the remote extremities of said half-shafts being formed with journal portions and with power transmitting ends.

3'. A mill pinion formed of cast manganese steel, and including a toothed shell with a half-shaft cast integral therewith, a second half-shaft, and means securing said second half-shaft to said shell and in alinement with the first-mentioned half-shaft.

4. A mill pinion formed of cast manganese steel, and including' a toothed shell with a half-shaft cast integral therewith, a second half-shaft, and means securing said second half-shaft to said shell and in alinement with the first-mentioned half-shaft, the remote extremities of said half-shafts being formed with power-transmittin ends.

5. An article of the class describe coniprising a shell, a hollow half-shaft formed integral therewith, and projecting from the one end thereof, a second. hollow half-shaft secured to said shell and held in alinement with the first-mentioned half-shaft thereby, said half-shafts provided with journal portions.

6. An article of the class described, comintegral therewith, and projecting from the one end thereof, a second shell and a hollow half shaft formed integral therewith, and means for holding said shells and halfshafts together, and in alinement, said halfshafts provided with journal portions and power transmitting ends. p

Signed at Chicagokin the county ,of Cook and State of Illinois, this 6th day of October A. D. 1915.

EDWARD S. BLACK. `Witnesseslzv N. C. BAsoN, EUGENE C. BAUER. 

